EP3787359A1 - Strahltrainingsverfahren, vorrichtung und system - Google Patents

Strahltrainingsverfahren, vorrichtung und system Download PDF

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Publication number
EP3787359A1
EP3787359A1 EP19798936.1A EP19798936A EP3787359A1 EP 3787359 A1 EP3787359 A1 EP 3787359A1 EP 19798936 A EP19798936 A EP 19798936A EP 3787359 A1 EP3787359 A1 EP 3787359A1
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EP
European Patent Office
Prior art keywords
interference
downlink signal
indication information
receive
terminal device
Prior art date
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Application number
EP19798936.1A
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English (en)
French (fr)
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EP3787359A4 (de
EP3787359B1 (de
Inventor
Peng Guan
Xiaoyong TANG
Xiaona Wang
Xi Zhang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of EP3787359A4 publication Critical patent/EP3787359A4/de
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Publication of EP3787359B1 publication Critical patent/EP3787359B1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H04L5/0025—Spatial division following the spatial signature of the channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • This application relates to the field of communications technologies, in particular, to a beam-based communications technology in a communications system, and specifically to a beam training method, apparatus, and system in the communications system.
  • a beam In a mobile communications system, transmission is performed through a beam, to be specific, a signal is sent in a specific direction in space, to achieve a higher antenna array gain.
  • the beam may be implemented by using a technology such as beamforming (Beamforming).
  • Beamforming beamforming
  • an important direction in high frequency (high frequency, HF) communication is analog and digital hybrid beamforming (hybrid Beamforming).
  • hybrid Beamforming hybrid Beamforming
  • beam training needs to be performed between a transmit end and a receive end.
  • weight values of analog beamforming at both the receive end and the transmit end need to be adjusted, so that a beam formed through the analog beamforming or the digital and analog hybrid beamforming can be aligned with a beam at a peer communication end, that is, beams are aligned, where a weight value of beamforming is usually obtained by sending a training signal.
  • a beam training result determines whether a signal can be normally transmitted. With a higher communication quality requirement, in addition to the beam alignment, more factors in communication need to be considered in beam training, to improve communication quality.
  • This application provides a beam training method, apparatus, and system, to perform beam training in consideration of another factor in communication, so that on-demand beam training can be effectively performed.
  • a beam training method and apparatus are provided.
  • the method is applied to a terminal device.
  • a network side sends interference-related indication information to a terminal side, so that the terminal device considers a corresponding interference factor during beam selection, to implement effective on-demand beam training.
  • the method includes: receiving interference-related indication information sent by a network device; receiving a downlink signal sent by the network device through two or more beams, where the two or more beams include a beam corresponding to interference; and sending, to the network device, information related to a selected beam, where the selected beam is a beam selected based on the interference-related indication information and a measurement result of the downlink signal. It may be understood that the interference is determined by the network device.
  • the network device may determine the interference based on whether there is a signal transmitted to another terminal device on the beam used to send the downlink signal to the terminal device, whether a beam is used as a serving beam to serve another terminal device, and the like, and send the interference-related indication information to the terminal device.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a physical downlink control channel demodulation reference signal PDCCH-DMRS, a physical downlink shared channel demodulation reference signal PDSCH-DMRS, a phase tracking reference signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in new radio (New Radio, NR for short), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS physical downlink control channel demodulation reference signal
  • the beam is selected in consideration of the interference factor in beam training, so that the effective on-demand beam training can be implemented.
  • a beam training apparatus can implement the corresponding method according to the first aspect.
  • the apparatus is limited in a functional form, and may be an entity on a terminal side.
  • a specific implementation of the apparatus may be a terminal device.
  • the apparatus may be a terminal device, or a chip or a function module in a terminal device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the first aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a network device.
  • the apparatus may further include a processing unit, and the processing unit is configured to select a beam based on interference-related indication information and a measurement result of the downlink signal.
  • a beam training method and apparatus are provided.
  • the method is applied to a network device, for example, an access node, or a transmission reception point having some functions of an access node on a network side.
  • the network side sends interference-related indication information to a terminal side, so that a terminal device considers a corresponding interference factor during beam selection, to implement effective on-demand beam training.
  • the method includes: sending interference-related indication information to the terminal device; sending a downlink signal to the terminal device through two or more beams, where the two or more beams include a beam corresponding to interference; and receiving information that is related to a beam selected by the terminal device and that is sent by the terminal device, where the selected beam is a beam selected by the terminal device based on the interference-related indication information and a measurement result of the downlink signal.
  • the interference is determined by the network device.
  • the network device may determine the interference based on whether there is a signal transmitted to another terminal device on the beam used to send the downlink signal to the terminal device, whether a beam is used as a serving beam to serve another terminal device, and the like, and send the interference-related indication information to the terminal device.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel de
  • the beam is selected in consideration of the interference factor in beam training, so that the effective on-demand beam training can be implemented.
  • a beam training apparatus can implement the corresponding method according to the second aspect.
  • the apparatus is limited in a functional form, and may be an entity on an access side.
  • a specific implementation of the apparatus may be an access node device.
  • the apparatus may be an access node device, or may be a chip or a function module in an access node device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the second aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to: send interference-related indication information and a downlink signal to a terminal device, and receive beam-related information sent by the terminal device.
  • the apparatus may further include a processing unit, and the processing unit is configured to determine the interference-related indication information.
  • the interference-related indication information is used to indicate a transmission resource for a downlink signal sent through the beam corresponding to the interference, and/or a receive beam for receiving a downlink signal sent through the beam corresponding to the interference.
  • the receive beam includes a receive beam for receiving a downlink signal corresponding to non-interference, and the downlink signal corresponding to the non-interference is a downlink signal sent through a beam corresponding to the non-interference in the two or more beams.
  • the receiving a downlink signal sent by the network device through two or more beams includes: receiving, based on the interference-related indication information through the receive beam for receiving the downlink signal corresponding to the non-interference, the downlink signal sent through the beam corresponding to the interference.
  • the interference-related indication information may indicate the terminal device to separately receive, through all receive beams for receiving downlink signals corresponding to the non-interference, downlink signals corresponding to the interference.
  • the interference-related indication information may alternatively indicate the terminal device to separately receive, through some receive beams for receiving downlink signals corresponding to the non-interference, downlink signals corresponding to the interference.
  • the interference-related indication information may alternatively indicate the terminal device to receive, through a receive beam for receiving a downlink signal corresponding to the non-interference, a downlink signal corresponding to the interference.
  • the terminal device receives, through the receive beam for receiving the downlink signal corresponding to the non-interference, the downlink signal corresponding to the interference, so that the terminal device can obtain an amount of interference caused by the downlink signal corresponding to the interference to another downlink signal corresponding to the non-interference.
  • an indication manner of the interference-related indication information includes an explicit indication manner or an implicit indication manner.
  • the network device may send the interference-related indication information to the terminal device in the explicit indication manner or the implicit indication manner.
  • the explicit indication manner includes: sending interference-related information.
  • the interference-related information includes at least one of the following: indication information for a transmission resource for sending a downlink signal through the beam corresponding to the interference, and indication information for a receive beam corresponding to the transmission resource.
  • an operation of the terminal device can be simplified in the explicit indication manner.
  • the implicit indication manner includes: configuring the interference-related indication information, where the interference-related indication information includes indication information for a transmission resource for sending a downlink signal through the beam corresponding to the interference, and indication information for a receive beam for a downlink signal that corresponds to non-interference and that is in the downlink signal sent through the two or more beams; and the downlink signal corresponding to the non-interference is a downlink signal that is in the downlink signal and that is not sent through the beam corresponding to the interference.
  • the interference-related indication information includes indication information for a transmission resource for sending a downlink signal through the beam corresponding to the interference, and indication information for a receive beam for a downlink signal that corresponds to non-interference and that is in the downlink signal sent through the two or more beams
  • the downlink signal corresponding to the non-interference is a downlink signal that is in the downlink signal and that is not sent through the beam corresponding to the interference.
  • the related information includes at least one of the following: a resource index for a downlink signal sent through the selected beam, a received power RSRP for the downlink signal sent through the selected beam, and interference amount information of the interference.
  • the terminal device may indicate the corresponding selected beam by reporting the resource index for the downlink signal, and may further report information such as the received power RSRP and an interference amount to the network device, for the network device to perform scheduling.
  • the interference amount may be a ratio of a received power for the downlink signal that is sent through the beam corresponding to the non-interference and that is received through a receive beam to a received power for the downlink signal that is sent through the beam corresponding to the interference and that is received through the same receive beam.
  • a beam training method and apparatus are provided.
  • the method is applied to a terminal device, and during beam selection, the terminal device selects, by considering a specific selection criterion for a beam to be reported in a group-based reporting manner, a beam to be reported in a group-based reporting manner, to implement effective on-demand beam training.
  • the method includes: receiving, by the terminal device, a downlink signal sent by a network device through two or more beams; and sending, by the terminal device to the network device, information related to the selected beam to be reported in the group-based reporting manner in the beams, where the beam to be reported in the group-based reporting manner is a beam selected by the terminal device according to a downlink signal reception and selection criterion; and the selection criterion is that downlink signals sent through the selected beam to be reported in the group-based reporting manner are received by the terminal device by using a same receive parameter, or downlink signals sent through the selected beam to be reported in the group-based reporting manner are received by the terminal device by using different receive parameters.
  • the selection criterion for the beam to be reported in the group-based reporting manner is not defined.
  • an unsuitable beam may exist in the to-be-reported beams and a network side does not know the existence of the unsuitable beam. Due to insufficient information for the network side, a scheduling error is caused.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel de
  • the related information includes at least one of the following: a resource index for the downlink signal corresponding to the beam to be reported in the group-based reporting manner, a received power for the downlink signal corresponding to the beam to be reported in the group-based reporting manner, and an interference amount.
  • the beam is selected in consideration of the specific selection criterion for the beam to be reported in the group-based reporting manner in beam training, so that the effective on-demand beam training can be implemented.
  • the method further includes: receiving, by the terminal device, indication information that is for the selection criterion and that is sent by the network device. It may be understood that, for the on-demand beam training, the selection criterion may be configured by the network side.
  • the method further includes: sending, by the terminal device, indication information for the selection criterion to the network device. It may be understood that, for the on-demand beam training, the terminal device may autonomously select the selection criterion, and send the indication information for the selection criterion to the network device, so that the network side has sufficient information, and no scheduling error is caused.
  • the method further includes: receiving configuration information that is for a quantity of groups and/or a quantity of beams in each group in group-based reporting and that is sent by the network device.
  • the network side may configure group information, and optionally, a group configuration may alternatively be agreed on in a unified manner.
  • the beam to be reported in the group-based reporting manner is a beam selected by the terminal device according to a downlink signal reception and selection criterion includes: measuring, by the terminal device, the received power for the downlink signal; and determining, based on a measurement result and the selection criterion, the beam to be reported in the group-based reporting manner. It may be understood that during the beam selection, the terminal device needs to consider signal quality in addition to the selection criterion for the beam to be reported in the group-based reporting manner.
  • a beam training apparatus can implement the corresponding method according to the third aspect.
  • the apparatus is limited in a functional form, and may be an entity on a terminal side.
  • a specific implementation of the apparatus may be a terminal device.
  • the apparatus may be a terminal device, or a chip or a function module in a terminal device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the third aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a network device.
  • the apparatus may further include a processing unit, and the processing unit is configured to select, according to a downlink signal reception and selection criterion, a beam to be reported in a group-based reporting manner.
  • a beam training method and apparatus are provided.
  • the method is applied to a network device, for example, an access node, or a transmission reception point having some functions of an access node on a network side.
  • a specific selection criterion for a beam to be reported in a group-based reporting manner is considered to select a beam to be reported in a group-based reporting manner, to implement effective on-demand beam training.
  • the method includes: sending, by the network device, a downlink signal to a terminal device through two or more beams; and receiving, by the network device, information that is related to the beam to be reported in the group-based reporting manner in the beams and that is sent by the terminal device, where the beam to be reported in the group-based reporting manner is selected by the terminal device according to a downlink signal reception and selection criterion; and the selection criterion is that downlink signals sent through the selected beam to be reported in the group-based reporting manner are received by the terminal device by using a same receive parameter, or downlink signals sent through the selected beam to be reported in the group-based reporting manner are received by the terminal device by using different receive parameters.
  • the selection criterion for the beam to be reported in the group-based reporting manner is not defined.
  • an unsuitable beam may exist in the to-be-reported beams and a network side does not know the existence of the unsuitable beam. Due to insufficient information for the network side, a scheduling error is caused.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel de
  • the related information includes at least one of the following: a resource index for the downlink signal corresponding to the beam to be reported in the group-based reporting manner, a received power for the downlink signal corresponding to the beam to be reported in the group-based reporting manner, and an interference amount.
  • the beam is selected in consideration of the specific selection criterion for the beam to be reported in the group-based reporting manner in beam training, so that the effective on-demand beam training can be implemented.
  • the method further includes: sending, by the network device, indication information for the selection criterion to the terminal device. It may be understood that, for the on-demand beam training, the selection criterion may be configured by the network side.
  • the method further includes: receiving, by the network device, indication information that is for the selection criterion and that is sent by the terminal device. It may be understood that, for the on-demand beam training, the terminal device may autonomously select the selection criterion, and send the indication information for the selection criterion to the network device, so that the network side has sufficient information, and no scheduling error is caused.
  • the method further includes: sending, by the network device to the terminal device, configuration information that is for a quantity of groups and/or a quantity of beams in each group in group-based reporting.
  • the network side may configure group information, and optionally, a group configuration may alternatively be agreed on in a unified manner.
  • that the beam to be reported in the group-based reporting manner is selected by the terminal device according to a downlink signal reception and selection criterion includes: measuring, by the terminal device, the received power for the downlink signal; and determining, based on a measurement result and the selection criterion, the beam to be reported in the group-based reporting manner. It may be understood that during the beam selection, the terminal device needs to consider signal quality in addition to the selection criterion for the beam to be reported in the group-based reporting manner.
  • a beam training apparatus can implement the corresponding method according to the fourth aspect.
  • the apparatus is limited in a functional form, and may be an entity on an access side.
  • a specific implementation of the apparatus may be an access node device.
  • the apparatus may be an access node device, or may be a chip or a function module in an access node device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the fourth aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a terminal device.
  • the apparatus may further include a processing unit, and the processing unit is configured to perform corresponding processing (for example, determine beam configuration information, or determine a selection criterion).
  • a beam training method and apparatus are provided.
  • the method is applied to a terminal device, and the terminal device considers a transport stream factor during beam selection, to implement effective on-demand beam training.
  • the method includes: receiving, by the terminal device, a downlink signal sent by a network device through one or more beams; and sending, by the terminal device to the network device, information related to a beam that is selected to be reported in the one or more beams, where the to-be-reported beam is a transmit beam that is for a downlink signal corresponding to a channel satisfying a rank condition and that is determined by the terminal device based on the downlink signal. It may be understood that a system capacity can be flexibly used in consideration of the transport stream factor.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel de
  • the beam is selected in consideration of the transport stream factor in beam training, so that the effective on-demand beam training can be implemented.
  • the method further includes: receiving, by the terminal device, indication information that is for the rank condition and that is sent by the network device. It may be understood that, for the on-demand beam training, a transport stream may be configured by a network side.
  • the method further includes: sending, by the terminal device, indication information for the rank condition to the network device. It may be understood that, for the on-demand beam training, the terminal device may autonomously select a selection criterion, and send the indication information for the selection criterion to the network device, so that the network side has sufficient information, and no scheduling error is caused.
  • the method further includes: if no corresponding channel determined based on the downlink signal satisfies the rank condition, sending, by the terminal device, abnormality indication information to the network device.
  • the sending, by the terminal device to the network device, information related to a beam that is selected to be reported in the one or more beams includes: sending, by the terminal device to the network device in a group-based reporting manner, the information related to the beam that is selected to be reported in the one or more beams.
  • Time-frequency resources that need to be reserved by the terminal device can be reduced in the group-based reporting manner, thereby greatly improving resource utilization.
  • a beam training apparatus can implement the corresponding method according to the fifth aspect.
  • the apparatus is limited in a functional form, and may be an entity on a terminal side.
  • a specific implementation of the apparatus may be a terminal device.
  • the apparatus may be a terminal device, or a chip or a function module in a terminal device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the fifth aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a network device.
  • the apparatus may further include a processing unit.
  • the processing unit is configured to determine, based on a downlink signal, whether a rank Rank of a corresponding channel satisfies a rank condition, to select a to-be-reported beam.
  • a beam training method and apparatus are provided.
  • the method is applied to a network device, for example, an access node, or a transmission reception point having some functions of an access node on a network side.
  • a transport stream factor is considered during beam training to implement effective on-demand beam training.
  • the method includes: sending, by the network device, a downlink signal to a terminal device through one or more beams; and receiving, by the network device, information that is related to a beam selected to be reported in the one or more beams and that is sent by the terminal device, where the to-be-reported beam is a transmit beam that is for a downlink signal corresponding to a channel satisfying a rank condition and that is determined by the terminal device based on the downlink signal. It may be understood that a system capacity can be flexibly used in consideration of the transport stream factor.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel de
  • the beam is selected in consideration of the transport stream factor in beam training, so that the effective on-demand beam training can be implemented.
  • the method further includes: sending, by the network device, indication information for the rank condition to the terminal device. It may be understood that, for the on-demand beam training, a transport stream may be configured by the network side.
  • the method further includes: receiving, by the network device, indication information that is for the rank condition and that is sent by the terminal device. It may be understood that, for the on-demand beam training, the terminal device may autonomously select the selection criterion, and send the indication information for the selection criterion to the network device, so that the network side has sufficient information, and no scheduling error is caused.
  • the method further includes: receiving, by the network device, abnormality indication information sent by the terminal device, where the abnormality indication information is sent by the terminal device when the terminal device determines, based on the downlink signal, that there is no corresponding channel satisfying the rank condition.
  • the receiving, by the network device, information that is related to a beam selected to be reported in the one or more beams and that is sent by the terminal device includes: receiving, by the network device, the information that is related to the beam selected to be reported in the one or more beams and that is reported by the terminal device in a group-based reporting manner. Time-frequency resources that need to be reserved by the terminal device can be reduced in the group-based reporting manner, thereby greatly improving resource utilization.
  • a beam training apparatus can implement the corresponding method according to the sixth aspect.
  • the apparatus is limited in a functional form, and may be an entity on an access side.
  • a specific implementation of the apparatus may be an access node device.
  • the apparatus may be an access node device, or may be a chip or a function module in an access node device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the sixth aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a terminal device.
  • the apparatus may further include a processing unit, and the processing unit is configured to perform corresponding processing (for example, determine indication information for a rank condition).
  • the foregoing six aspects provide the technical solutions of beam training in a downlink direction, and the following provides technical solutions of beam training in an uplink direction.
  • a beam training method and apparatus are provided.
  • the method is applied to a terminal device, and the terminal device considers a gain factor during uplink beam selection according to a gain adjustment indication of a network device, to implement effective on-demand beam training.
  • the method includes: sending, by the terminal device, a first uplink signal to the network device; receiving, by the terminal device, the gain adjustment indication sent by the network device, where the gain adjustment indication is determined by the network device by measuring the first uplink signal; and sending, by the terminal device, a second uplink signal to the network device, where the second signal is an uplink signal sent by the terminal device after the terminal device performs gain adjustment on an antenna according to the gain adjustment indication.
  • the uplink signal includes but is not limited to a channel sounding signal (Sounding Reference Signal, SRS for short), a physical uplink control channel demodulation reference signal (PUCCH Demodulation Reference Signal, PUCCH-DMRS for short), an uplink data channel demodulation reference signal PUSCH-DMRS, an uplink phase noise tracking signal (phase noise tracking reference signal, PTRS for short), and the like.
  • Sounding Reference Signal Sounding Reference Signal
  • PUCCH-DMRS physical uplink control channel demodulation reference signal
  • PUCCH-DMRS physical uplink control channel demodulation reference signal
  • PUSCH-DMRS uplink data channel demodulation reference signal
  • PTRS phase noise tracking reference signal
  • the beam is selected in consideration of the gain adjustment factor in uplink beam training, so that the effective on-demand beam training can be implemented.
  • the terminal device may perform omnidirectional sweeping in space, or may perform narrow beam sweeping in a wide beam range as indicated by the network device.
  • the terminal device sweeps a plurality of high-gain narrow beams in space, that is, sends uplink signals through different high-gain narrow beams.
  • the method further includes: receiving an indication for information that is related to a beam used by the terminal device to send the second uplink signal and that is sent by the network device, where the transmit beam indication includes at least one of the following: a resource index for sending the first uplink signal, beam-related information of random access in an access process, and an ID of a resource/an SSB of a corresponding reciprocity-based CSI-RS.
  • the resource index for the first uplink signal and the beam-related information of the random access in the access process may be used to indicate a wide beam that has been used by the terminal device previously, to provide a specific reference for the terminal device, so that spatial sweeping of the terminal device can focus on a specific wide beam range.
  • a beam training apparatus can implement the corresponding method according to the seventh aspect.
  • the apparatus is limited in a functional form, and may be an entity on a terminal side.
  • a specific implementation of the apparatus may be a terminal device.
  • the apparatus may be a terminal device, or a chip or a function module in a terminal device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the seventh aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a network device.
  • the apparatus may further include a processing unit, and the processing unit is configured to determine gain adjustment.
  • a beam training method and apparatus are provided.
  • the method is applied to a network device, for example, an access node, or a transmission reception point having some functions of an access node on a network side.
  • a terminal device considers a gain factor during uplink beam selection according to a gain adjustment indication of the network device, to implement effective on-demand beam training.
  • the method includes: receiving, by the network device, a first uplink signal sent by the terminal device; sending, by the network device, the gain adjustment indication to the terminal device, where the gain adjustment indication is an indication determined by the network device by measuring the first uplink signal; and receiving, by the network device, a second uplink signal sent by the terminal device, where the second signal is an uplink signal sent after gain adjustment on an antenna according to the gain adjustment indication.
  • the uplink signal includes but is not limited to a channel sounding signal (Sounding Reference Signal, SRS for short), an uplink control channel demodulation reference signal (PUCCH De-modulation Reference Signal, PUCCH-DMRS for short), an uplink data channel demodulation reference signal PUSCH-DMRS, an uplink phase noise tracking signal (phase noise tracking reference signal, PTRS for short), and the like.
  • SRS Sounding Reference Signal
  • PUCCH-DMRS uplink control channel demodulation Reference Signal
  • PUCCH-DMRS uplink data channel demodulation reference signal
  • PUSCH-DMRS uplink phase noise tracking signal
  • PTRS phase noise tracking reference signal
  • the beam is selected in consideration of the gain adjustment factor in uplink beam training, so that the effective on-demand beam training can be implemented.
  • the terminal device may perform omnidirectional sweeping in space, or may perform narrow beam sweeping in a wide beam range as indicated by the network device.
  • the terminal device sweeps a plurality of high-gain narrow beams in space, that is, sends uplink signals through different high-gain narrow beams.
  • the method further includes: sending, by the network device to the terminal device, an indication for information related to a beam used by the terminal device to send the second uplink signal, where the transmit beam indication includes at least one of the following: a resource index for sending the first uplink signal, beam-related information of random access in an access process, and an ID of a resource/an SSB of a corresponding reciprocity-based CSI-RS.
  • the resource index for the first uplink signal and the beam-related information of the random access in the access process may be used to indicate a wide beam that has been used by the terminal device previously, to provide a specific reference for the terminal device, so that spatial sweeping of the terminal device can focus on a specific wide beam range.
  • a beam training apparatus can implement the corresponding method according to the eighth aspect.
  • the apparatus is limited in a functional form, and may be an entity on an access side.
  • a specific implementation of the apparatus may be an access node device.
  • the apparatus may be an access node device, or may be a chip or a function module in an access node device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • the apparatus may include a processor and a memory.
  • the processor is configured to support the apparatus in performing a corresponding function in the method according to the eighth aspect.
  • the memory is configured to couple to the processor, and stores a program (an instruction) and data that are necessary for the apparatus.
  • the apparatus may further include a communications interface, configured to support the apparatus in communicating with another network element.
  • the communications interface may be a transceiver.
  • the apparatus may include a transceiver unit, and the transceiver unit is configured to communicate with a terminal device.
  • the apparatus may further include a processing unit, and the processing unit is configured to determine gain adjustment by measuring a first uplink signal.
  • an indication manner of the gain adjustment includes an explicit indication manner or an implicit indication manner.
  • the network device may send the gain adjustment indication to the terminal device in the explicit indication manner or the implicit indication manner.
  • the explicit indication manner includes: sending indication information for a target antenna gain, or sending indication information for an adjustment factor of an antenna gain.
  • An operation of the terminal device can be simplified in the explicit indication manner.
  • the implicit indication method includes: sending a calculation parameter used by the terminal device to determine a transmit power, where the calculation parameter is used to enable the transmit power determined by the terminal device to exceed a preset transmit power threshold.
  • the terminal device determines the transmit power that exceeds the threshold, so that the terminal device increases a transmit antenna gain to avoid exceeding the threshold, thereby adjusting the gain.
  • the calculation parameter includes at least one of the following: a value P0 specified by the network device, a scaling coefficient ⁇ indicated by the network device, and a path loss estimation reference.
  • the implicit indication method includes: sending a first calculation parameter and a second calculation parameter that are used by the terminal device to determine a transmit power, where a difference between the first calculation parameter and the second calculation parameter is a gain adjustment amount of the antenna.
  • the first calculation parameter includes a value P0_1 specified by the network device
  • the second calculation parameter includes a value P0_2 specified by the network device.
  • the implicit indication method includes: sending a received power and a target received power at which the network device receives the first uplink signal, so that the terminal device adjusts the gain based on the target received power, to achieve the target received power. Signaling overheads can be reduced in the implicit indication manner.
  • This application further provides a computer storage medium.
  • the computer storage medium stores a computer program (an instruction).
  • the program (instruction) is run on a computer, the computer is enabled to perform the method according to any one of the foregoing aspects.
  • This application further provides a computer program product.
  • the computer program product When the computer program product is run on a computer, the computer is enabled to perform the method according to any one of the foregoing aspects.
  • This application further provides a chip.
  • the chip stores an instruction, and when the instruction is run on a communications device, the communications device is enabled to perform the corresponding methods according to the foregoing aspects.
  • the apparatus includes a memory, a processor, and a computer program that is stored in the memory and that can be run on the processor.
  • the processor executes the computer program, implements the corresponding methods according to the foregoing aspects.
  • the apparatus includes a processor.
  • the processor is configured to: couple to a memory, read an instruction in the memory, and implement, according to the instruction, the corresponding methods according to the foregoing aspects. It may be understood that the memory may be integrated into the processor, or may be independent of the processor.
  • the apparatus includes a processor.
  • the processor When executing a computer program, the processor implements the corresponding methods according to the foregoing aspects.
  • the processor may be a special purpose processor.
  • This application further provides a system, including the foregoing provided terminal-side apparatus and the foregoing provided network-side apparatus.
  • the system components separately implement the corresponding methods according to the foregoing aspects.
  • any apparatus, computer storage medium, computer program product, chip, or system provided above is configured to implement the corresponding method provided above. Therefore, for beneficial effects that can be achieved by the apparatus, computer storage medium, computer program product, chip, or system, refer to the beneficial effects of the corresponding method, and details are not described herein again.
  • a plurality of in this application refers to two or more than two.
  • the term “and/or” in this application describes only an association relationship for describing associated objects and represents that three relationships may exist.
  • a and/or B may represent the following three cases: Only A exists, both A and B exist, and only B exists.
  • the character "/" in this specification usually indicates an "or” relationship between the associated objects.
  • the terms “first”, “second”, “third”, “fourth”, and the like are intended to distinguish between different objects but do not indicate a particular order of the objects.
  • nouns "network” and “system” are usually interchangeably used, but a person skilled in the art can understand meanings of the nouns.
  • all "terminals"/"terminal devices” mentioned in this application may be mobile devices, for example, mobile phones, personal digital assistants, handheld or laptop computers, and similar devices having a telecommunications capability.
  • the "terminals"/"terminal devices” may alternatively be wearable devices or vehicle-mounted devices, and include terminals in a future 5G network, terminals in a future evolved PLMN, or the like.
  • Such a terminal may include a device and a removable storage module (for example, including but not limited to, a subscriber identification module (Subscriber Identification Module, SIM for short) application, a universal subscriber identification module (Universal Subscriber Identification Module, USIM for short) application, or a universal integrated circuit card (Universal Integrated Circuit Card, UICC for short) of a removable user identity module (Removable User Identity Module, R-UIM for short) application) associated with the device.
  • a terminal may include a device that does not have the module.
  • the term "terminal"/"terminal device” may be a non-portable device having a similar capability, for example, a desktop computer, a set top box, or a network device.
  • terminal may alternatively be any hardware or software component that can terminate a communication session of a user.
  • “user terminal”, “User Equipment”, “UE”, “site”, “station”, “STA”, “user device”, “user agent”, “User Agent”, “UA”, “user apparatus”, “mobile device”, and “device” are substitute terms that are synonymous with the "terminal"/"terminal device” in this specification.
  • the foregoing devices are collectively referred to as user equipment or UE.
  • An “access node” mentioned in this application is a network device, is an apparatus deployed in a radio access network to provide a wireless communication function for a terminal device, and has functions such as being responsible for scheduling and configuring a downlink signal for UE.
  • the access node may include various forms of macro base stations, micro base stations, relay stations, access points, and the like, may be a base transceiver station (Base Transceiver Station, BTS for short) in global system for mobile communications (Global System of Mobile communication, GSM for short) or code division multiple access (Code Division Multiple Access, CDMA for short), or a NodeB (NodeB, NB for short) in wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA for short), or an evolved NodeB (Evolutional Node B, eNB or eNodeB for short) in long term evolution (Long Term Evolution, LTE for short), or a relay station or an access point, or a transmission node or transmission reception point (transmission reception point, T
  • a device having an access node function may have different names.
  • the foregoing apparatuses providing a wireless communication function for UE are collectively referred to as the access node.
  • beam-based communication means that in a mobile communications system, transmission is performed by using a beam, to be specific, a signal is sent in a specific direction in space, to achieve a higher antenna array gain.
  • the beam may be implemented by using a technology such as beamforming (Beamforming).
  • Beamforming beamforming
  • an important research direction in high frequency (high frequency, HF for short) communication is analog and digital hybrid beamforming (hybrid Beamforming).
  • hybrid Beamforming hybrid Beamforming
  • Quasi-co-location (quasi-co-location, QCL for short): A quasi-co-location relationship is used to indicate that a plurality of resources have one or more same or similar communication features. A same or similar communication configuration may be used for the plurality of resources having the quasi-co-location relationship. For example, if two antenna ports have a quasi-co-location relationship, a large-scale property of a channel over which a signal is transmitted on one port may be inferred from a large-scale property of a channel over which a signal is transmitted on the other port.
  • the large-scale property may include delay spread, an average delay, Doppler spread, Doppler frequency shift, an average gain, a receive parameter, a receive beam number of a terminal device, transmit/receive channel correlation, an angle of arrival, spatial correlation of a receiver antenna, a dominant angle of arrival (Angle-of-Arrival, AoA), an average angle of arrival, AoA spread, and the like.
  • a quasi-co-location indication is used to indicate whether at least two groups of antenna ports have the quasi-co-location relationship is:
  • the quasi-co-location indication is used to indicate whether channel state information reference signals sent on the at least two groups of antenna ports are from a same transmission point; or the quasi-co-location indication is used to indicate whether channel state information reference signals sent on the at least two groups of antenna ports are from a same beam group.
  • Quasi-co-location assumption It is assumed whether a QCL relationship exists between two ports.
  • a configuration and an indication for the quasi-co-location assumption may be used to help a receive end receive and demodulate a signal.
  • the receive end can determine that a QCL relationship exists between a port A and a port B.
  • a large-scale parameter of a signal measured on the port A may be used to measure and demodulate a signal on the port B.
  • a beam is a communication resource.
  • the beam may be a wide beam, a narrow beam, or a beam of another type.
  • a technology for forming a beam may be a beamforming technology or another technical means.
  • the beamforming technology may be specifically a digital beamforming technology, an analog beamforming technology, or a digital/analog hybrid beamforming technology. Different beams may be considered as different resources. Same information or different information may be sent through different beams. Optionally, a plurality of beams having same or similar communication features may be considered as one beam.
  • One beam may include one or more antenna ports, configured to transmit a data channel, a control channel, a sounding signal, and the like.
  • a transmit beam may be distribution of signal strength formed in different directions in space after a signal is transmitted through an antenna
  • a receive beam may be distribution of signal strength, in different directions in space, of a radio signal received from an antenna.
  • one or more antenna ports forming one beam may also be considered as one antenna port set.
  • a beam may also be referred to as a spatial filter (spatial filter).
  • the index information may correspond to a resource identifier of configured for the UE.
  • the index information may correspond to an ID or a resource configured for channel state information reference signal (Channel status information Reference Signal, CSI-RS for short), or may correspond to an ID or a resource of configured for uplink sounding reference signal (Sounding Reference Signal, SRS for short).
  • the index information may be index information explicitly or implicitly carried by a signal or a channel carried through a beam.
  • the index information may be index information of the beam indicated by a synchronization signal or a broadcast channel sent through the beam.
  • the beam information may be identified by using an absolute index of the beam, a relative index of the beam, a logical index of the beam, an index of an antenna port corresponding to the beam, an index of an antenna port group corresponding to the beam, a time index of a downlink synchronization signal block; beam pair link (beam pair link, BPL) information, a transmit parameter (Tx parameter) corresponding to the beam, a receive parameter (Rx parameter) corresponding to the beam, a transmit weight (weight) corresponding to the beam, a weight matrix (weight matrix), a weight vector (weight vector), a receive weight corresponding to the beam, or indexes thereof; a sending codebook (codebook) corresponding to the beam, a receiving codebook corresponding to the beam, or indexes thereof.
  • BPL beam pair link
  • Spatial quasi-co-location The spatial QCL may be considered as a type of QCL. Spatial may be understood from two perspectives: a transmit end or a receive end. From the perspective of the transmit end, if two antenna ports are spatial quasi-co-location, it means that beam directions corresponding to the two antenna ports are the same in space. From the perspective of the receive end, if two antenna ports are spatial quasi-co-location, it means that the receive end can receive, in a same beam direction, signals sent on the two antenna ports.
  • FIG. 1 shows an architecture of a network system in this application.
  • This application is applicable to a beam 300-based multi-carrier communications system, for example, 5G new radio (New Radio, NR for short), shown in FIG. 1 .
  • the system includes uplink (from UE 200 to an access node 100) communication and downlink (from the access node 100 to the UE 200) communication in the communications system. Both the uplink communication and the downlink communication are performed based on a beam 300 that is directed to a spatial direction.
  • the uplink communication at a physical layer includes transmission of an uplink physical channel and transmission of an uplink signal.
  • LTE Long Term Evolution
  • the uplink physical channel includes a random access channel (Random access channel, PRACH for short), a physical uplink control channel (Physical uplink control channel, PUCCH for short), a physical uplink shared channel (Physical uplink shared channel, PUSCH for short), and the like.
  • the uplink signal includes a channel sounding signal SRS, an uplink control channel demodulation reference signal (PUCCH De-modulation Reference Signal, PUCCH-DMRS for short), an uplink data channel demodulation reference signal PUSCH-DMRS, an uplink phase noise tracking signal (phase noise tracking reference signal, PTRS for short), and the like.
  • the downlink communication includes transmission of a downlink physical channel and transmission of a downlink signal.
  • the downlink physical channel includes a broadcast channel (Physical broadcast channel, PBCH for short), a downlink control channel (Physical downlink control channel, PDCCH for short), a downlink data channel (Physical downlink shared channel, PDSCH for short), and the like.
  • PBCH Physical broadcast channel
  • PDCCH Physical downlink control channel
  • PDSCH Physical downlink shared channel
  • the downlink signal includes a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDCCH-DMRS downlink data channel demodulation reference signal
  • PDSCH-DMRS downlink data channel demodulation reference signal
  • beam training needs to be performed between the access node 100 and the UE 200.
  • the access node 100 and the UE 200 reach preliminary beam alignment, and then the UE 200 can access a network.
  • the access node 100 configures a group of reference signals and/or synchronization signal blocks and sends the group of reference signals and/or synchronization signal blocks through different transmit beams to the UE 200 for measurement, and the UE 200 receives the group of reference signals and/or synchronization signal blocks through a receive beam, and selects one or more of the transmit beams for feedback to the access node 100.
  • the beam management includes uplink beam management and downlink beam management.
  • the uplink beam management is mainly classified into two types: uplink signal-based uplink beam management and downlink signal-based uplink beam management.
  • the uplink signal-based uplink beam management usually does not require a beam consistency assumption, but the downlink signal-based uplink beam management usually requires a beam consistency assumption.
  • SRS resource set may be used to train a transmit beam on a UE 200 side.
  • beam training between the access node 100 and the UE 200 is mainly completed through measurement and feedback on a downlink signal. Based on beam consistency, a receive beam selected for a terminal side after the downlink training may be used as a reference of a transmit beam for uplink transmission.
  • an interference factor is considered in the downlink beam management.
  • the access node 100 obtains prior information and learns that one or more signals are being transmitted through one or more beams 300. After the UE 200 accesses the network, if the access node 100 sends a downlink signal to the UE 200 through the beam 300, the access node 100 uses the beam 300 as interference, and sends interference-related indication information to the UE 200, to indicate, in an explicit or implicit indication manner, the UE 200 to consider the interference factor when the UE 200 selects a beam.
  • the UE 200 selects, according to a refined selection criterion, a beam to be reported in a group-based reporting manner, to be specific, the UE 200 receives the downlink signal by using a same receive parameter or different receive parameters.
  • the selection criterion may be preconfigured by the access node 100 for the UE 200.
  • the UE 200 may autonomously select the selection criterion, and send indication information for the selection criterion to the access node 100, so that a network side has sufficient information, and no scheduling error is caused.
  • the UE 200 selects a beam by considering the transport stream factor based on channel estimation.
  • a transport stream condition may be preconfigured by the access node 100 for the UE 200 by using a rank (Rank) indication.
  • the UE 200 may autonomously select a transport stream condition, and send indication information for the rank condition to the access node 100, so that the network side has sufficient information, and no scheduling error is caused.
  • the access node 100 determines, based on quality of a previously received uplink signal that is sent by the UE 200, whether gain adjustment needs to be performed on a subsequent uplink beam of the UE 200, to enhance uplink coverage without adjusting an uplink transmit power.
  • the access node 100 sends a gain adjustment indication to the UE 200, and the UE 200 adjusts the gain of the antenna based on the gain adjustment indication and then sends an uplink signal.
  • FIG. 1 shows merely an example of the architecture of the network system in this application, and this application is not limited thereto.
  • UE establishes a connection to an access node, and the UE and the access node perform beam training by using a method in this embodiment, so that when selecting a beam, the UE considers a specific factor, such as an interference factor.
  • the access node can provide a communication service having higher quality for the UE.
  • interaction between the UE and the access node is used as an example for description in this embodiment and subsequent embodiments, and this application is not limited thereto.
  • TRP managed by the access node in the network has some functions related to the access node, this application may further be applied to a scenario in which the UE interacts with the TRP to perform beam training. According to this embodiment of this application, FIG.
  • FIG. 2 is a flowchart of an embodiment of a beam training method according to this application.
  • behavior on both a UE side and an access node side is described in this embodiment and the subsequent embodiments, and is described as a whole from perspectives of all the interaction sides.
  • the technical solution provided in this application has improvements on all the sides in the system.
  • the method includes the following steps.
  • the access node sends interference-related indication information to the UE.
  • FIG. 3 is a schematic diagram of a beam-based communication scenario.
  • An access node 100 transmits data to UE 2 through a transmit beam 2.
  • the access node 100 provides a beam training resource for UE 1, and the access node 100 sends interference-related indication information to the UE 1, to indicate that the UE 1 needs to consider, when performing beam training, interference caused by the transmit beam 2.
  • the UE 1 if the interference is not considered, because a transmit beam 1 and a receive beam 1 (a receive parameter 1) of the UE 1 are line of sight (LOS) aligned, a communications link including the transmit beam 1 and the receive beam 1 (the receive parameter 1) has minimum attenuation.
  • a transmit beam 3 and a receive beam 2 are reflection path aligned, a communications link including the transmit beam 3 and the receive beam 2 (the receive parameter 2) has relatively large attenuation.
  • the transmit beam 1 and the receive beam 1 are a better combination, and the UE 1 needs to feed back an identifier of the transmit beam 1 to the access node 100.
  • the UE 1 uses the receive beam 1, the UE 1 is interfered with by a signal on the transmit beam 2. If the interference caused by the transmit beam 2 is relatively large, the UE 1 should not select the transmit beam 1 as a serving beam and feed back the identifier of the transmit beam 1.
  • the interference-related indication information may be carried in configuration information sent by the access node to the UE.
  • the interference-related indication information may be sent by using a radio resource control (Radio Resource Control, RRC for short) message and/or downlink control information (Downlink Control Information, DCI for short), or may be sent to a terminal device by including the interference-related indication information in a MAC CE.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the interference-related indication information may be indicated in an explicit indication manner or an implicit indication manner.
  • An example in which the configuration information carries the interference-related indication information is used below for description. It should be understood that this application is not limited to this example. It should be noted that, to clarify an association relationship of the configuration information, the following descriptions start from an access phase, and other steps before this step that are not necessary for resolving the technical problem in this application are included:
  • the access node and the UE reach preliminary beam alignment for the first time, and then the UE can access a network.
  • a synchronization signal block (SS/PBCH block, SSB for short) is used as an example.
  • a beam indication for a corresponding beam sent through a beam or a reference signal that is used on a downlink channel is implemented by associating the beam indication with a reference resource index in a transmission configuration indicator (Transmission Configuration Indicator, TCI for short) state table.
  • TCI Transmission Configuration Indicator
  • a base station configures a TCI state table (corresponding to TCI-states in 38.331) by using RRC higher layer signaling.
  • a TCI is a beam indication method.
  • a structure of the TCI is as follows:
  • the TCI may include a plurality of parameters, for example, a cell number, a BWP ID, a reference signal ID, a synchronization signal block ID, and a QCL type.
  • a terminal may determine a receiving method as indicated by the TCI. For example, a beam indication of a control channel is a TCI state, the terminal may receive the control channel by using a QCL assumption corresponding to a QCL type in the TCI state used for receiving a reference signal or a synchronization signal block corresponding to a reference signal ID or a synchronization signal block ID in the TCI state.
  • the access node may use the SSB index #0 as a reference of a beam direction, and configure the information as the TCI and notify the UE of the TCI.
  • a correspondence maintained on a UE side is as follows: TCI #0 SSB index #0 Receive beam #0
  • a CSI-RS is used as an example.
  • the access node may configure a CSI-RS resource for the UE for further beam management. To achieve accurate beam alignment, the access node and the UE side may separately sweep their transmit beams and receive beams.
  • the access node may indicate a beam direction of the CSI-RS resource, so that receiving of the CSI-RS resource performed by the UE is facilitated. For example, the access node configures a CSI-RS resource #x and a CSI-RS resource #y, and indicates the UE to perform receive beam sweeping.
  • a resource index is configured to indicate/represent a corresponding CSI-RS.
  • CSI-RS resource # is used to represent a corresponding CSI-RS, and the CSI-RS is not described separately again.
  • CSI-RS resource #y TCI #0 Measurement manner Receive beam sweeping
  • the UE may adjust a parameter of a receive antenna. For example, the UE further determines, based on a receive beam #0 corresponding to the TCI #0, to use a receive beam #1 and a receive beam #2 to measure a CSI-RS resource #1 and a CSI-RS resource #2. In this way, the following association relationships are obtained.
  • receive beam sweeping or transmit beam sweeping is controlled by using a value ON/OFF of a repetition field in NR. To avoid introducing too many concepts, only words are used for description herein.
  • the TCI state may be reconfigured on an access node side.
  • the SSB index #0, the CSI-RS resource #x, and the CSI-RS resource #y are all signals that have been transmitted/measured.
  • TCI #0 SSB index #0 TCI #1 CSI-RS resource #x TCI #2 CSI-RS resource #y
  • the UE side After receiving the configuration, the UE side obtains the following association relationships: TCI #0 SSB index #0 Receive beam #0 TCI #1 CSI-RS resource #x Receive beam #1 TCI #2 CSI-RS resource #y Receive beam #2
  • the access node side may reconfigure a beam management resource.
  • the interference-related indication information is indicated in an implicit indication manner.
  • An optional configuration is: beam management resources ⁇ the CSI-RS resource #1, the CSI-RS resource #2, and a CSI-RS resource #3 ⁇ , and the following reference signal resource QCL indications: CSI-RS resource #1 TCI #1 CSI-RS resource #2 CSI-RS resource #3 TCI #2
  • a resource that is in the beam management resource set and that has no QCL indication is interference. It can be learned that the CSI-RS resource #2 in this example is indicated interference.
  • the interference-related indication information is indicated in an explicit indication manner.
  • an optional configuration is: beam management resources ⁇ the CSI-RS resource #1, the CSI-RS resource #2, and a CSI-RS resource #3 ⁇ , an explicit interference source indication ⁇ the CSI-RS resource #2 ⁇ , and the following reference signal resource QCL indications: CSI-RS resource #1 TCI #1 CSI-RS resource #2 TCI #1 and TCI #2 CSI-RS resource #3 TCI #2
  • the CSI-RS resource #2 is explicitly indicated as an interference source, and the UE is indicated to separately receive the CSI-RS resource #2 through the receive beam 1 for receiving the CSI-RS resource #1 and the receive beam 2 for receiving the CSI-RS resource #3, to measure the interference.
  • an optional configuration is: beam management resources ⁇ the CSI-RS resource #1, the CSI-RS resource #2, the CSI-RS resource #3, and a CSI-RS resource #4 ⁇ ; an explicit interference source indication ⁇ the CSI-RS resource #2 and the CSI-RS resource #4 ⁇ , where both the CSI-RS resource#2 and the CSI-RS resource#4 are beams (for example, the beam 2 in FIG. 3 ) corresponding to the interference; and the following reference signal resource QCL indications: CSI-RS resource #1 TCI #1 CSI-RS resource #2 TCI #1 CSI-RS resource #3 TCI #2 CSI-RS resource #4 TCI #2
  • Another configuration manner is as follows: Beam quality measurement Interference beam measurement QCL indication CSI-RS resource #1 CSI-RS resource #2 TCI #1 CSI-RS resource #3 CSI-RS resource #2 TCI #2
  • the foregoing several configuration manners are intended to notify the UE that the CSI-RS resource#2 (in some cases, the CSI-RS resource #4 is further included) is interference, and the UE needs to consider impact of the interference during further beam selection.
  • the foregoing configurations are merely examples.
  • an indication for the interference is not limited to the foregoing examples, and the interference-related indication information may be used to indicate a transmission resource for a downlink signal sent through a beam corresponding to the interference, and/or a receive beam for receiving a downlink signal sent through a beam corresponding to the interference.
  • the indication information may not only indicate the terminal device to separately receive, through all receive beams for receiving downlink signals corresponding to non-interference, downlink signals corresponding to the interference.
  • the interference-related indication information may alternatively indicate the terminal device to separately receive, through some receive beams for receiving downlink signals corresponding to non-interference, downlink signals corresponding to the interference.
  • the interference-related indication information may alternatively indicate the terminal device to receive, through a receive beam for receiving a downlink signal corresponding to non-interference, a downlink signal corresponding to the interference.
  • the terminal device receives, through the receive beam for receiving the downlink signal corresponding to the non-interference, the downlink signal corresponding to the interference, so that the terminal device can obtain an amount of interference caused by the downlink signal corresponding to the interference to another downlink signal corresponding to the non-interference.
  • the terminal device may alternatively receive, by default, the downlink signal through the receive beam for receiving the downlink signal corresponding to the non-interference, without an indication of the access node.
  • the access node sends a downlink signal through two or more beams, where the two or more beams include the beam corresponding to the interference.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel demodulation
  • a downlink physical channel may further be included, and the downlink physical channel includes a broadcast channel (Physical broadcast channel, PBCH for short), a downlink control channel (Physical downlink control channel, PDCCH for short), a downlink data channel (Physical downlink shared channel, PDSCH for short), and the like.
  • PBCH Physical broadcast channel
  • PDCCH Physical downlink control channel
  • PDSCH downlink shared channel
  • the UE measures the received downlink signal, and selects a beam.
  • the UE receives the downlink signal based on the configuration performed by the access node.
  • the foregoing example is used for description.
  • the UE receives the CSI-RS resource #1 through the receive beam 1, and receives the CSI-RS resource #3 through the receive beam 2.
  • the UE further receives, based on the interference-related indication information, a downlink signal sent through the beam corresponding to the interference.
  • impact caused by the interference on different receive beams (or receive parameters) is considered, and the UE separately receives the CSI-RS resource #2 (including the CSI-RS resource #4 in some cases) corresponding to the interference through the receive beam 1 and the receive beam 2.
  • the UE may perform pairing and selection on a transmit beam and a receive beam by comparing a ratio RSRP #1-1/RSRP#1-2 of a reference signal received power (Reference Signal Received Power, RSRP for short) RSRP #1-1 of the CSI-RS resource #1 to a reference signal received power RSRP #1-2 of the CSI-RS resource #2 on the receive beam 1 with a ratio RSRP #2-3/RSRP #2-2 of a reference signal received power RSRP #2-3 of the CSI-RS resource #3 to a reference signal received power RSRP #2-2 of the CSI-RS resource #2 on the receive beam 2.
  • RSRP #1-1/RSRP#1-2 Reference Signal Received Power
  • RSRP #1-1 of the CSI-RS resource #1 to a reference signal received power RSRP #1-2 of the CSI-RS resource #2 on the receive beam 1
  • the receive beam 2 (or the receive parameter 2) is a better receive beam, and a transmit beam corresponding to the CSI-RS resource #3 may be used as a serving beam selected by the UE.
  • reference signal received quality reference signal received quality, RSRQ for short
  • a signal to interference plus noise ratio signal to interference and noise ratio, or SINR
  • SINR signal to interference and noise ratio
  • S104 The UE feeds back, to the access node, information related to the selected beam.
  • the UE may report, by using at least one of the following information, the selected transmit beam used as the serving beam: a resource index (CSI-RS resource index, CRI for short) of a downlink reference signal sent through a corresponding beam, for example, ⁇ CRI #1 ⁇ ; a received power (for example, the RSRP #1-1) for the downlink signal; an interference amount, where optionally, the interference amount may be a ratio, for example, the RSRP #1-1/the RSRP #1-2, of the received power (for example, the RSRP #1-1) for the downlink signal to a received power (for example, the RSRP #1-2) for the downlink signal corresponding to the interference; and the received power (for example, the RSRP #1-2) for the downlink signal corresponding to the interference.
  • a resource index CSI-RS resource index, CRI for short
  • CRI resource index
  • an indicator such as RSRQ or an SINR may alternatively be used.
  • the related information is reported, so that the access node learns of the beam selected by the UE.
  • the access node may further learn of information such as the received power and the interference amount. This provides a better reference for further configuration performed by the access node.
  • the beam is selected in consideration of the interference factor in the beam training, so that the effective on-demand beam training can be implemented.
  • FIG. 4 is a flowchart of an embodiment of another beam training method according to this application.
  • on-demand beam training in this embodiment is for reporting of a plurality of beam combinations, for example, group-based reporting.
  • a beam to be reported in a group-based reporting manner is selected by using a specific beam selection criterion, to implement beam training.
  • behavior on both a UE side and an access node side is described in this embodiment, and is described as a whole from perspectives of all the interaction sides.
  • an improvement in a system is that steps on all the interaction sides need to be performed together.
  • the technical solution provided in this application has improvements on all the sides in the system.
  • the method includes the following steps.
  • S201 UE determines a selection criterion for a beam to be reported in a group-based reporting manner.
  • a network side sends a downlink signal to the UE through a transmit beam, the UE receives the downlink signal through a receive beam (corresponding to a receive parameter), and the UE measures the downlink signal and selects a serving beam.
  • beam selection is for a case of group-based reporting, that is, the selected transmit beam on the network side satisfies "simultaneously reception" performed by the UE in some sense.
  • the network side sends a CSI-RS #1 through a transmit beam beam 1, sends a CSI-RS #2 through a transmit beam beam 2, and sends a CSI-RS #3 through a transmit beam beam 3, and the UE can receive the CSI-RS #1 and the CSI-RS #3 on a corresponding CSI-RS resource #1 and a corresponding CSI-RS resource #3 through a receive beam of the UE, it may be assumed that if the UE simultaneously uses both the CSI-RS resource #1 and the CSI-RS resource #3, the UE can simultaneously receive both the CSI-RS #1 and the CSI-RS #3.
  • the UE reports the beam 1 and the beam 3 as a group (where specifically, during implementation, the UE may select and report the beam 1 and the beam 3 by reporting the CSI-RS resource #1 and the CSI-RS resource #3 as a group).
  • the UE receives the CSI-RS #1 and the CSI-RS #3 on the corresponding CSI-RS resource #1 and the corresponding CSI-RS resource #3 through a same receive beam (by using a same receive parameter). In the other case, the UE receives the CSI-RS #1 and the CSI-RS #3 on the corresponding CSI-RS resource #1 and the corresponding CSI-RS resource #3 through different receive beams (by using different receive parameters).
  • the selection criterion is that downlink signals sent through a selected beam to be reported in a group-based reporting manner are received by the UE by using a same receive parameter, or downlink signals sent through a selected beam to be reported in a group-based reporting manner are received by the UE by using different receive parameters.
  • the selection criterion for the beam to be reported in the group-based reporting manner may be configured by the network side (for example, an access node or a TRP) for the UE.
  • the selection criterion may be carried in configuration information sent to the UE, may be sent by using a radio resource control (Radio Resource Control, RRC for short) message and/or downlink control information (Downlink Control Information, DCI for short), or may be sent to a terminal device by adding the selection criterion to a MAC CE.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the network side may configure group information, or a group configuration may be agreed on in a unified manner.
  • the network side sends, to the UE, configuration information (which may be configured by using an RRC message, DCI, and a MAC CE in a manner similar to the foregoing selection criterion configuration) for a quantity of groups and/or a quantity of beams in each group in the group-based reporting.
  • configuration information which may be configured by using an RRC message, DCI, and a MAC CE in a manner similar to the foregoing selection criterion configuration
  • the selection criterion for the beam to be reported in the group-based reporting manner may alternatively be determined by the UE based on an actual situation or based on a capability of the UE. If the selection criterion is determined by the network side, the network side knows the selection criterion according to which a beam to be reported in a group-based reporting manner is selected.
  • the network side can have more reference information during beam scheduling. If the selection criterion is determined by the UE, the UE needs to send information about the selection criterion to the network side. Optionally, the UE may notify the network side of a supported selection criterion before the group-based reporting, or may notify the network side of a selection criterion for a beam to be reported in a group-based reporting manner during or after the group-based reporting, so that the network side can have more reference information during beam scheduling.
  • the access node may send a signal to the UE 1 through the beam 1, and send a signal to the UE 2 through the beam 3. Therefore, if the UE does not define the selection criterion for the beam to be reported in the group-based reporting manner for "simultaneously reception", a problem occurs when the access node performs scheduling.
  • the access node sends a downlink signal to the UE through two or more beams.
  • the access node sends the downlink signal to the UE through two or more beams, so that the UE can measure the downlink signal, to implement the beam training.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PDCCH-DMRS downlink control
  • step S201 there is no necessary sequence between step S201 and step S202, and flexible configuration may be performed according to different solutions.
  • S203 The UE selects, according to a downlink signal reception and selection criterion, a beam to be reported in a group-based reporting manner.
  • the UE By receiving the downlink signal, the UE selects the beam to be reported in the group-based reporting manner from the beams.
  • the terminal device measures a received power RSRP for the downlink signal, and determines, based on a measurement result and the selection criterion, the beam to be reported in the group-based reporting manner.
  • the terminal device may alternatively measure an indicator such as RSRQ or an SINR of the downlink signal. It may be understood that during the beam selection, the terminal device needs to consider signal quality in addition to the selection criterion for the beam to be reported in the group-based reporting manner.
  • the UE should be able to group the beams on which reception can be simultaneously performed by using the same receive parameter into one group, and compare beam quality of each group.
  • the network side indicates the UE to group beams on which reception needs to be simultaneously performed by using different receive parameters into one group, the UE needs to group the beams on which reception needs to be simultaneously performed by using the different receive parameters into one group, and compare beam quality of each group.
  • Beam quality of one group of beams may be an average value of quality of a plurality of beams in the group, or a capacity of a multi-antenna channel including the plurality of beams in the group, or stability of a link including the plurality of beams, or the like.
  • the UE may determine, based on an indicator such as the capability of the UE, beam quality, a channel capacity, or robustness, a grouping method most suitable for the UE, and group beams on which reception can be simultaneously performed by using a same receive parameter into one group or group beams on which reception needs to be simultaneously performed by using different receive parameters into one group.
  • an indicator such as the capability of the UE, beam quality, a channel capacity, or robustness
  • S204 The UE sends, to the access node, information related to the selected beam to be reported in the group-based reporting manner.
  • the related information includes at least one of the following: a resource index (CSI-RS resource index, CRI for short) for the downlink signal corresponding to the beam to be reported in the group-based reporting manner, a received power for the downlink signal corresponding to the beam to be reported in the group-based reporting manner, an interference amount (which may be a ratio of received powers), and a group identifier.
  • CSI-RS resource index, CRI for short CSI-RS resource index
  • CRI resource index
  • the related information may be ⁇ a CRI #1, a CRI #3, an RSRP #1, an RSRP #3, and the RSRP #1/the RSRP #3 ⁇ .
  • the UE may send, to the network side during the group-based reporting, the selection criterion for the beam to be reported in the group-based reporting manner.
  • the selection criterion may be indicated by using a bitmap or a value of a corresponding field.
  • the UE may add information to each group-based reporting to describe a grouping method. For example, a bit "0" indicates that reception on beams in the group can be simultaneously performed by using a same receive parameter, and a bit "1" indicates that reception on beams in the group can be simultaneously performed by using different receive parameters.
  • the beam training method in this embodiment of this application during the beam training, the beam is selected in consideration of the specific selection criterion for a beam to be reported in a group-based reporting manner, to avoid a problem occurring when the access node performs scheduling because "simultaneously reception" may be implemented by the UE in different manners. Therefore, the method in this embodiment of this application can implement effective on-demand beam training.
  • FIG. 5 is a flowchart of an embodiment of still another beam training method according to this application.
  • a difference between this embodiment and both Embodiment 1 and Embodiment 2 lies in that, a transport stream factor is considered in on-demand beam training in this embodiment.
  • behavior on both a UE side and an access node side is described in this embodiment, and is described as a whole from perspectives of all the interaction sides. However, it is not limited to a case in which an improvement in a system is that steps on all the interaction sides need to be performed together.
  • the technical solution provided in this application has improvements on all the sides in the system.
  • the method includes the following steps.
  • S301 UE determines a rank (Rank) condition.
  • a rank (Rank) of a MIMO channel matrix reflects a maximum quantity of transport streams that can be supported by a current channel.
  • ranks of MIMO channels including different beams or beam combinations are different.
  • a network side transmits data to the UE, multi-stream transmission can be used to effectively improve spectrum efficiency.
  • the network side needs to serve a plurality of UEs, and a quantity of transport streams allocated to each UE is determined by using a scheduling algorithm. Therefore, the UE needs to select a beam or a beam combination that can support the quantity of streams to form a MIMO channel for multi-stream data transmission.
  • the UE may perform channel estimation based on the downlink signal.
  • the UE may perform beam pairing and selection based on a requirement on a quantity of channel transport streams.
  • the rank condition may be configured by the network side and sent to the UE, and information about the rank condition may be sent by using at least one of an RRC message, DCI, and a MAC CE.
  • the rank condition includes at least one of the following: a rank value indication, for example, a rank 2 or a rank 4; an MCS (modulation and coding scheme, modulation and coding scheme) requirement or an SINR requirement, where for example, channel quality corresponding to each rank of a MIMO channel including beams selected by the UE needs to support a specific signal modulation scheme and/or coding scheme, or needs to be greater than a specific SINR, and optionally, the SINR requirement may alternatively be embodied as a CQI (channel quality indicator) indicator; and a minimum MCS requirement or a minimum SINR requirement of each flow.
  • the rank condition may further include a codebook indication.
  • the rank condition may further include a beam indication.
  • the network side may indicate the UE to select a beam paired with a transmit beam to form a multi-beam MIMO channel.
  • the rank condition may be autonomously selected by the UE.
  • the UE may notify the network side of the selected rank condition, so that the network side has sufficient information, and no scheduling error is caused.
  • S302 An access node sends a downlink signal to the UE through one or more beams.
  • the downlink signal includes but is not limited to a primary synchronization signal (Primary Synchronization Signal, PSS for short)/secondary synchronization signal (Secondary Synchronization Signal, SSS for short), a downlink control channel demodulation reference signal PDCCH-DMRS, a downlink data channel demodulation reference signal PDSCH-DMRS, a phase noise tracking signal PTRS, a channel state information reference signal (Channel status information reference signal, CSI-RS for short), a cell signal (Cell Reference Signal, CRS for short) (which does not exist in NR), a fine synchronization signal (Time/frequency tracking Reference Signal, TRS for short) (which does not exist in LTE), and the like.
  • a primary synchronization signal Primary Synchronization Signal, PSS for short
  • secondary synchronization signal Secondary Synchronization Signal, SSS for short
  • PDCCH-DMRS downlink control channel demodulation reference signal
  • PDSCH-DMRS downlink data channel de
  • step S301 there is no necessary sequence between step S301 and step S302, and flexible configuration may be performed according to different solutions.
  • S303 The UE performs channel estimation based on the downlink signal, and selects a transmit beam for a downlink signal corresponding to a channel satisfying the rank condition.
  • the UE performs beam pairing based on receiving of the downlink signal, and determines, based on a channel matrix, one or more beams satisfying the rank condition.
  • the one or more beams satisfying the rank condition may be understood as one or more beams that can form a channel on which a quantity of ranks is greater than or equal to a quantity of ranks in the rank condition.
  • S304 The UE sends, to the access node, information related to the selected to-be-reported beam in the beams.
  • the UE may send, to the access node in a group-based reporting manner, the related information of the selected to-be-reported beam in the beams.
  • Time-frequency resources that need to be reserved by the terminal device can be reduced in the group-based reporting manner, thereby greatly improving resource utilization.
  • the related information includes: a resource index for the downlink signal sent through the corresponding beam, or a received power for the downlink signal, or an interference amount.
  • the related information is reported, so that the access node learns of the beam selected by the UE.
  • the access node may further learn of information such as the received power and the interference amount. This provides a better reference for further configuration performed by the access node.
  • the UE may further notify the access node of the rank condition during beam reporting.
  • the UE sends abnormality indication information to the access node.
  • the beam is selected in consideration of the transport stream factor in the beam training, so that effective on-demand beam training can be implemented.
  • Embodiment 2 and Embodiment 3 respectively provide beam selection in consideration of the selection criterion (interference is considered) and beam selection in consideration of the quantity of transport streams.
  • a robustness indicator for example,
  • the capacity is a rate at which information can be transmitted on a channel. Maximizing the capacity is maximizing a transmission rate that can be supported by a beam or a beam combination selected by the UE.
  • the UE may calculate a channel capacity by measuring channels including different beams or beam combinations.
  • FIG. 6 is a flowchart of an embodiment of yet another beam training method according to this application. Behavior on both a UE side and an access node side is described in this embodiment, and is described as a whole from perspectives of all the interaction sides. However, it is not limited to a case in which an improvement in a system is that steps on all the interaction sides need to be performed together. The technical solution provided in this application has improvements on all the sides in the system.
  • the method includes the following steps.
  • S401 UE sends a first uplink signal to an access node.
  • the uplink signal includes but is not limited to a channel sounding signal (Sounding Reference Signal, SRS for short), an uplink control channel demodulation reference signal (PUCCH De-modulation Reference Signal, PUCCH-DMRS for short), an uplink data channel demodulation reference signal PUSCH-DMRS, an uplink phase noise tracking signal (phase noise tracking reference signal, PTRS for short), and the like.
  • SRS Sounding Reference Signal
  • PUCCH-DMRS uplink control channel demodulation Reference Signal
  • PUCCH-DMRS uplink data channel demodulation reference signal
  • PUSCH-DMRS uplink phase noise tracking signal
  • PTRS phase noise tracking reference signal
  • the access node determines a gain adjustment indication based on a measurement result of the first uplink signal.
  • requirements for uplink beams of the UE are different.
  • the UE needs to be explicitly indicated to use a narrower beam for communication.
  • PL DL pure PL UL pure
  • the signal strength attenuation caused by the uplink transmission path is the same as that caused by the downlink transmission path.
  • a basic uplink transmit power control principle is estimating a path loss and inferring strength of a signal arriving at a receive end.
  • the following is an SRS power control method.
  • P UE Tx P 0 + ⁇ ⁇ PL DL AGG + others
  • P UE Tx is a power at which the UE sends a signal
  • P 0 is a value specified by the access node
  • ⁇ is a scaling coefficient indicated by the access node
  • PL DL AGG is a path loss estimated by the UE (where the access node may indicate a reference downlink signal for the path loss estimation)
  • others are some adjustment amounts including a bandwidth.
  • “others” may be considered or may not be considered. For a further example, descriptions are provided below by using an example in which "others" is not considered temporarily.
  • an optional method is increasing G UE Tx and/or increasing G BS Rx (that is, using a UE transmit beam or an access node receive beam having a higher gain).
  • gain adjustment on the UE side is used for description. Therefore, the access node determines the UE gain adjustment indication based on the measurement result of the first uplink signal.
  • the access node sends the gain adjustment indication to the UE.
  • an indication manner of the gain adjustment includes an explicit indication manner or an implicit indication manner.
  • a network device may send the gain adjustment indication to the UE in the explicit indication manner or the implicit indication manner.
  • the explicit indication manner includes: sending indication information for a target antenna gain, for example, indicating to send an uplink signal by using a transmit antenna gain of 17 dBi; or sending indication information for an antenna gain adjustment factor, that is, the indication information indicates how much dB is added to a current antenna gain, for example, antenna gain + 5 dB.
  • An operation of the UE can be simplified in the explicit indication manner.
  • the implicit indication method includes: sending a calculation parameter used by the UE to determine a transmit power, where the calculation parameter is used to enable the transmit power determined by the UE to exceed a preset transmit power threshold.
  • the UE determines the transmit power that exceeds the threshold, so that the UE increases a transmit antenna gain to avoid exceeding the threshold, thereby adjusting the gain.
  • the calculation parameter includes at least one of the following: a value P 0 specified by a network side, a scaling coefficient ⁇ indicated by the network side, and a path loss estimation reference.
  • the implicit indication method includes: sending a first calculation parameter and a second calculation parameter that are used by the UE to determine a transmit power, where the first calculation parameter includes a value P 0_1 specified by the network device, and the second calculation parameter includes a value P 0_2 specified by the network device.
  • P 0_1 is the same as the existing P 0
  • the implicit indication method includes: sending a received power and a target received power at which the access node receives the first uplink signal, so that the UE adjusts the gain based on the target received power to achieve the target received power.
  • the access node feeds back that quality of the uplink signal received by the access node is -100 dBm, and require target quality of the terminal to reach -90 dBm. Signaling overheads can be reduced in the implicit indication manner.
  • the UE has a plurality of beam forms.
  • the UE has a plurality of low-gain wide beams and a plurality of high-gain narrow beams.
  • there is a correspondence between a wide beam and a narrow beam and the correspondence is a one-to-one correspondence, a one-to-many correspondence, or a many-to-one correspondence.
  • the UE may support the plurality of beam forms through capability reporting.
  • a base station may indicate the UE to switch a beam form, to increase an antenna gain, thereby improving uplink transmission quality.
  • the base station may indicate the UE to perform uplink transmission or uplink beam training by using a wide beam #1, and indicate the UE to switch a beam form to a narrow beam. In this case, the UE needs to perform the uplink transmission or the uplink beam training by using a narrow beam corresponding to the wide beam #1.
  • the gain adjustment indication may be carried in configuration information sent by the access node to the UE, may be sent by using an RRC message and/or DCI, or may be carried in a MAC CE and sent to the UE.
  • S404 The UE performs gain adjustment on an antenna according to the gain adjustment indication.
  • the UE adjusts a gain of the antenna, to send a subsequent uplink signal through the antenna after the gain is adjusted.
  • S405 The UE sends a second uplink signal to the access node.
  • the UE adjusts the gain of the antenna, and sends the second uplink signal to the access node after the gain is adjusted. That is, during uplink beam training is performed, the gain adjustment factor is considered.
  • the UE may perform omnidirectional sweeping in space, or may perform narrow beam sweeping in a wide beam range as indicated by the network device. In this application, the UE sweeps a plurality of high-gain narrow beams in space, that is, sends uplink signals through different high-gain narrow beams.
  • the method before the sending a second uplink signal to the network device, the method further includes: receiving an indication for information that is related to a beam used by the UE to send the second uplink signal and that is sent by the network device, where the transmit beam indication includes at least one of the following: a resource index for sending the first uplink signal, beam-related information of random access in an access process, and an ID of a resource/an SSB of a corresponding reciprocity-based CSI-RS.
  • the resource index for the first uplink signal and the beam-related information of the random access in the access process may be used to indicate a wide beam that has been used by the UE previously, to provide a specific reference for the UE, so that spatial sweeping of the UE can focus on a specific wide beam range.
  • the beam is selected in consideration of the gain adjustment factor in the uplink beam training, so that the effective on-demand beam training can be implemented.
  • the foregoing embodiments mainly describes the solutions provided in the embodiments of this application from a perspective of interaction between entities in a system or a perspective of an internal implementation process of an entity. It may be understood that to implement the foregoing functions, the foregoing various entities include hardware structures and/or software modules corresponding to the various functions.
  • a person skilled in the art should easily be aware that, in combination with units and algorithm steps of the examples described in the embodiments disclosed in this specification, this application may be implemented by hardware or a combination of hardware and computer software. Whether a function is performed by hardware or hardware driven by computer software depends on particular applications and design constraints of the technical solutions. A person skilled in the art may use different methods to implement the described functions for each particular application, but it should not be considered that the implementation goes beyond the scope of this application.
  • function module division may be performed on the UE and the access node according to the examples of the methods.
  • various function modules may be divided according to the corresponding functions, or two or more functions may be integrated into one processing module.
  • the integrated module may be implemented in a form of hardware, or may be implemented in a form of a software function module.
  • the division into modules is an example, and is merely a logical function division. In an actual implementation, another division manner may be used.
  • function modules are divided based on functions is used below for description.
  • FIG. 7 is a simplified schematic structural diagram of a terminal device.
  • the terminal device 70 includes a processor, a memory, a radio frequency circuit, an antenna, and an input/output apparatus.
  • the processor is mainly configured to: process a communications protocol and communication data, control the terminal device 70, execute a software program, process data of the software program, and the like.
  • the memory is mainly configured to store a software program and data.
  • the radio frequency circuit is mainly configured to: perform conversion between a baseband signal and a radio frequency signal, and process the radio frequency signal.
  • the antenna is mainly configured to send and receive a radio frequency signal in a form of an electromagnetic wave.
  • the input/output apparatus such as a touchscreen, a display, or a keyboard, is mainly configured to receive data entered by a user and output data to the user. It should be noted that some types of terminal devices 70 may have no input/output apparatus.
  • the memory and the processor may be integrated together or may be disposed independently.
  • the radio frequency circuit and the processor may be integrated together or may be disposed independently.
  • the processor When data needs to be sent, after performing baseband processing on the to-be-sent data, the processor outputs a baseband signal to the radio frequency circuit; and the radio frequency circuit performs radio frequency processing on the baseband signal and then sends a radio frequency signal to the outside in a form of an electromagnetic wave through the antenna.
  • the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data, and processes the data.
  • FIG. 7 shows only one memory and one processor. In an actual terminal device product, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium, a storage device, or the like.
  • the memory may be disposed independent of the processor, or may be integrated with the processor. This is not limited in this embodiment of this application.
  • the antenna and the radio frequency circuit that have transmission and reception functions may be considered as a transceiver unit of the terminal device 70
  • the processor that has a processing function may be considered as a processing unit of the terminal device 70.
  • the terminal device 70 includes a transceiver unit 701 and a processing unit 702.
  • the transceiver unit may also be referred to as a transceiver (including a transmitter and/or a receiver), a transceiver machine, a transceiver apparatus, a transceiver circuit, or the like.
  • the processing unit may also be referred to as a processor, a processing board, a processing module, a processing apparatus, or the like.
  • a component that is in the transceiver unit 701 and that is configured to implement a receiving function may be considered as a receiving unit
  • a component that is in the transceiver unit 701 and that is configured to implement a sending function may be considered as a sending unit.
  • the transceiver unit 701 includes the receiving unit and the sending unit.
  • the transceiver unit sometimes may also be referred to as a transceiver machine, a transceiver, a transceiver circuit, or the like.
  • the receiving unit sometimes may also be referred to as a receiver machine, a receiver, a receive circuit, or the like.
  • the sending unit sometimes may also be referred to as a transmitter machine, a transmitter, a transmit circuit, or the like.
  • the transceiver unit 701 and the processing unit 702 may be integrated together, or may be disposed independently.
  • all functions of the processing unit 702 may be integrated into one chip for implementation.
  • some functions may be integrated into one chip for implementation and some other functions are integrated into one or more other chips for implementation. This is not limited in this application.
  • the term "unit" used in this specification may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), a memory, or a combinational logic circuit that executes one or more software or firmware programs, and/or other suitable components that provide the function.
  • ASIC application-specific integrated circuit
  • processor shared, dedicated, or group
  • memory or a combinational logic circuit that executes one or more software or firmware programs, and/or other suitable components that provide the function.
  • the transceiver unit 701 may be configured to perform receiving and/or sending operations of the UE in S101, S102, and/or S104 in FIG. 2 , and/or other steps in this application.
  • the processing unit 702 may be configured to perform S103 in FIG. 2 , and/or other steps in this application.
  • the transceiver unit 701 may be configured to perform receiving and/or sending operations of the UE in S202 and/or S204 in FIG. 4 , and/or other steps in this application.
  • the processing unit 702 may be configured to perform S201 and/or S203 in FIG. 4 , and/or other steps in this application.
  • the transceiver unit 701 may be configured to perform receiving and/or sending operations of the UE in S302 and/or S304 in FIG. 5 , and/or other steps in this application.
  • the processing unit 702 may be configured to perform S301 and/or S303 in FIG. 5 , and/or other steps in this application.
  • the transceiver unit 701 may be configured to perform receiving and/or sending operations of the UE in S401, S403, and/or S405 in FIG. 6 , and/or other steps in this application.
  • the processing unit 702 may be configured to perform S404 in FIG. 6 , and/or other steps in this application.
  • FIG. 8 is a simplified schematic structural diagram of a network device.
  • the network device 80 includes a part 801 and a part 802.
  • the part 801 is mainly configured to send and receive a radio frequency signal and perform conversion between the radio frequency signal and a baseband signal.
  • the part 802 is mainly configured to perform baseband processing, control the network device 80, and the like.
  • the part 801 may be usually referred to as a transceiver unit, a transceiver machine, a transceiver circuit, a transceiver, or the like.
  • the part 802 is usually a control center of the network device 80, and may usually be referred to as a processing unit, a control unit, a processor, a controller, or the like.
  • the part 802 is configured to control the network device 80 to perform the steps performed by the access node/transmission reception point that is related to a measurement function entity on an access side or is used as a measurement function entity on an access side in the foregoing related embodiments. For details, refer to the foregoing descriptions of the related parts.
  • the transceiver unit in the part 801 may also be referred to as a transceiver machine, a transceiver, or the like.
  • the transceiver unit includes an antenna and a radio frequency unit.
  • the radio frequency unit is mainly configured to perform radio frequency processing.
  • a component that is in the part 801 and that is configured to implement a reception function may be considered as a receiving unit, and a component that is configured to implement a transmission function may be considered as a sending unit.
  • the part 801 includes the receiving unit and the sending unit.
  • the receiving unit may also be referred to as a receiver machine, a receiver, a receiver circuit, or the like.
  • the sending unit may be referred to as a transmitter machine, a transmitter, a transmit circuit, or the like.
  • the part 802 may include one or more boards. Each board may include one or more processors and one or more memories, and the processor is configured to read and execute a program in the memory, to implement a baseband processing function and control the network device 80. If there are a plurality of boards, the boards may be interconnected to enhance a processing capability. In an optional implementation, the plurality of boards may share one or more processors, or the plurality of boards may share one or more memories, or the plurality of boards may simultaneously share one or more processors.
  • the memory and the processor may be integrated together, or may be disposed independently. In some embodiments, the part 801 and the part 802 may be integrated together, or may be disposed independently. In addition, all functions of the part 802 may be integrated into one chip for implementation. Alternatively, some functions may be integrated into one chip for implementation and some other functions are integrated into one or more other chips for implementation. This is not limited in this application.
  • the transceiver unit may be configured to perform receiving and/or sending operations of the access node in S101, S102, and/or S104 in FIG. 2 , and/or other steps in this application.
  • the processing unit may be configured to perform operations such as determining interference-related indication information and determining a beam training result in the embodiment related to FIG. 2 , and/or other steps in this application.
  • the transceiver unit may be configured to perform receiving and/or sending operations of the access node in S202 and/or S204 in FIG. 4 , and/or other steps in this application.
  • the processing unit may be configured to perform operations such as determining a selection criterion and determining a beam training result in the embodiment related to FIG. 4 , and/or other steps in this application.
  • the transceiver unit may be configured to perform receiving and/or sending operations of the access node in S302 and/or S304 in FIG. 5 , and/or other steps in this application.
  • the processing unit may be configured to perform operations such as determining a rank (Rank) condition and determining a beam training result in the embodiment related to FIG. 5 , and/or other steps in this application.
  • the transceiver unit may be configured to perform receiving and/or sending operations of the access node in S401, S403, and/or S405 in FIG. 6 , and/or other steps in this application.
  • the processing unit may be configured to perform S402 in FIG. 6 , and/or other steps in this application.
  • the foregoing provided terminal-side apparatus may be a terminal device, or may be a chip or a function module in a terminal device, and may implement the foregoing method by software or hardware, or by hardware executing corresponding software.
  • a specific implementation of the foregoing provided network-side apparatus may be an access node device.
  • the apparatus may be an access node device, or may be a chip or a function module in an access node device.
  • the foregoing method may be implemented by software, hardware, or by hardware executing corresponding software.
  • This application further provides a beam training system, including the UE (or a UE side apparatus implementing the foregoing UE function) and the access node (or an access side apparatus or a transmission reception point implementing the foregoing access node function) in the foregoing implementations.
  • This application further provides a computer program product.
  • the computer program product When the computer program product is run on a computer, the computer is enabled to perform any method provided above.
  • This application further provides a chip.
  • the chip stores an instruction, and when the instruction is run on the foregoing devices, the devices are enabled to perform the foregoing provided methods.
  • This application further provides a computer storage medium.
  • the computer storage medium stores a computer program (an instruction).
  • the program (instruction) is run on a computer, the computer is enabled to perform the method according to any one of the foregoing aspects.
  • All or some of the foregoing embodiments may be implemented through software, hardware, firmware, or any combination thereof.
  • a software program is used to implement the embodiments, the embodiments may be implemented or partially in a form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of this application are all or partially generated.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or another programmable apparatus.
  • the computer instructions may be stored in a computer-readable storage medium or may be transmitted from a computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (digital subscriber line, DSL)) or wireless (for example, infrared, radio, or microwave) manner.
  • the computer-readable storage medium may be any usable medium accessible by a computer, or a data storage device, such as a server or a data center, integrating one or more usable media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid-state drive (solid state disk, SSD)), or the like.
  • a magnetic medium for example, a floppy disk, a hard disk, or a magnetic tape
  • an optical medium for example, a DVD
  • a semiconductor medium for example, a solid-state drive (solid state disk, SSD)

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  • Computer Networks & Wireless Communication (AREA)
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CN201810451328.3A CN110475355B (zh) 2018-05-11 2018-05-11 一种波束训练的方法、装置及系统
PCT/CN2019/086447 WO2019214725A1 (zh) 2018-05-11 2019-05-10 一种波束训练的方法、装置及系统

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US11496204B2 (en) 2022-11-08
EP3787359A4 (de) 2021-06-23
EP3787359B1 (de) 2023-11-22
BR112020022873A2 (pt) 2021-03-23
CA3100559A1 (en) 2019-11-14
US20210067233A1 (en) 2021-03-04
CA3100559C (en) 2023-10-17
CN110475355B (zh) 2023-06-23
WO2019214725A1 (zh) 2019-11-14

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